Lubricating system for drill heads



Dec. 20, 1927.

' D. C. KLAUSMEYER LUBRICATING SYSTEM FOR DRILL HEADS 1924 4 Sheets-Sheet 1 Filed Deo. 9

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- D. C. KLAUSMEYER LUBRICATING SYSTEM FOR DRILL HEADS Filed Deo. 9, 1924 4 Sheets-Sheet 2` Dec. 20, 1927.

D. c. KLAUSMEYER LUBRICATING SYSTEM FOR DRILL HEADS Filed Deo.'9. 1924 4 Sheets-Sheet 3 //l/l/l//l//l//l/l/l/l/l, w

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D. C. KLAUSMEYER 4LUBRICTING SYSTEM FOR DRILL HEADS Filed Deo. 9, 19,24

4 Sheets-Sheet 4 Patented Dec. 20, 1927.

.UNITED STATES PATENT OFFICE.,

DAVID C. KLAUSMEYER, OF CINCINNATI, OHIO, ASSIGNOR TO THE CINCINNATI BICK- FORD TOOL COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

LUBRICATING SYSTEM FOR DRILL HEADS.

Application filed December 9, 1924. Serial No. 754,761.

This invention relates to machine tools and it deals more particularly with means for continuously lubricating the mechanism embodied in a radial-drill head.

Radial drills, as lcommonly constructed, comprise a base, an upright column, an arm extending radially from said column and a drill-head translatably mounted on the arm. lVithin the drill-head is rotatably journaled a spindle adapted to carry a drill-point which is fed into the work by endwise movement of the drill-spindle. Power to rotate the drill-spindle and to feed it vertically is usually taken from a shaft journaled lengthwise of the arm and rotated from any suitable source of power, such for example as a motor mounted upon an extension of the arm or upon the base at the foot of the column and operatively Connected With the arm shaft. Inasmuch as these machines are adapted to operate on various types of work with various types and sizes of tools, such as'drills and taps of varying diameters, and as each tool requires a different speed of rotation for maximum efficiency, it is necessary that means be provided for regulating the speed of rotation of the drill-spindle.

Until more or less recently this has been accomplished by embodying in the transmission, adjacent the prime mover, a speed controller which provided a number of speed changes, usually about six. These speed changes were multiplied by a set of speed change gears (known as the back-gears) located within the drill-head. These backgears usually produced four speed changes which, in combination with the six speeds provided by the first named speed-controller, rendered available twenty-four spindle speeds which selectively'could be employed.

Recently, however, machine-toolsof this type have been greatly improved and the shifting of the gears to produce any desired spindle speed greatly facilitated by an iml'novement in the drill-head which includes the embodiment therein of all of the speedchange gears. This improvement rendered it practicable to provide a substantially greater nuingberof speed changes for the spindle and to provide gear-shifting means carried by the drill-head and within easy reach of the operator, whereby `he could selectively employ any available spindle speed without moving from his position at his 55 work. While this installation :of all ofthe change-gears in the head resulted in adeclded improvement in radial drills, it Will readily be perceived that it also presented the problem of proper lubrication for all of the many shaft bearings and gears necessarily employed. It is this problem that this invention has solved in a very eliicient and ingenious manner.

In embodying all of the speed change gears in the drill-head it has been necessary '65 to employ many bearings and many gears located in various horizontal and vertical planes. To t-he end that dirt, small particles of abrasives etc., (which are always present to more or less degree in machine 'I0 shops) out of the bearings and gears it has been found desirable, if not actually imperaf tive, to have these parts wholly enclosed Within a suitable casing. This also has added to the problem of proper lubrication of the parts. Furthermore certain of the bearings, such as for example the-bearings for the spindle, are necessarily open at one end and therefore should not be supplied with an over-abundance of lubricant other- Wise the lubricant Will drip from the bearing upon the Work and upon the operator, much to his annoyance and discomfort.

This invention therefore has for an object to provide a lubricating system adapted to be embodied in the drill-head of a radialdrill which will continuously and abundantly lubricate all of the gears and bearings Within the drill-head.

A further object of the invention is to provide a lubricating system for drill-heads in which the amount of lubricant vsupplied to certain of the bearings is positively controlled.

A'still further object of the invention is 96 to provide a continuously acting lubricatin system for radial drill-heads wholly embo ied in the drill-head and so arranged as not to be effected by translation of the drillhead on the radial arm. y

Still another object is to .provide a drillv head with a self-contained circulatory lubricating system in which the amountpf lubricant supplied to certain of the movlng parts is substantially constant re rdless of the speed of rotation of the spin le.

Another object of the invention is to provide a drill-head with a self-contained continuously operatingl lubricating stem of which one portion is circulatory an .another in which is located all of the mechanism necessary selectively to rotate the spindle at any one of a considerable number of different s ee s from a single speed shaft journale lengthwise of the arm, and mechanism to translate the spindle vertically to cause the drill point carried thereby to be fed into the work. Forv the purpose of continuously and generously lubricating the parts, the ,h ousing is formed in its lower endywith a lubricant reservoir and a continuously operating pump, also carried by the housing, draws lubricant from the reservoir, elevates it through suitable piping to the top of the housing where it is ejected from a nozzle and permitted to cascade down over all of the mechanism in the housing and through the various bearings. The spindle necessarily projects through the lower end of its bearing and to prevent an over-abundance of oil being supplied to the bearin which would result in the oil dripping t erefrom, means is provided for lregulating the flow of oil thereto. This is preferably accomplished by supplying oil Ito the bearing through an o1l tube connected at one end to an auxiliary. reservoir located in the upper end of the housing and having 'its other end extending downwardly into a bore in the spindle. A transverse aperture of small diameter extends from the bore through the wall of the spindle vand permits a slight seepage of oil to the spindle bearing. A sight feed oiler, connected to the upper end of the tube and provided with an adjustable needle valve affords means lfor regulating and indicating the rate of iow ofv oil into the spindle bore. A second sight feed oiler adapted to receive a substantial amount of the oil ejected from j the nozzle, affords means by which the operator may readily determine the action of the ump.

ile this invention is herein shown and described in connection with a drill-head having all of the speed-change gears embodied therein, it is to be understood that it is likewise adaptable to various other types ofdrill-heads such, for example as those which contain only the back-gears.

, Other objects and advantages will be in part indicated in the following description and in partrendered apparent therefrom in connection with the annexed drawings.

To enable others skilled'in the art so fully to apprehendthe underlying features hereof t at they may embody the same in the various ways contemplated by this invention, drawin depicting a preferred typical construction have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote correspon parts throughout all` the views, of which Fig. 1 is a central vertical section of a radial-drill head embodying thepresent invention. Fig. 2 is a Side elevation ofthe entire drill-head casing which for convenience of manufacture preferably comprises front, re'ar, cover an reservoir sections. Fig. 3 is a vertical section of the upper sec- ,called the cover. Fig. 4 is a front elevation of the cover showing more particularly certain sight-feed oilers later to bel referred to. Fig. 5 is a section on the line 5-5 of Fig. 3. Fig. 6 is a view on the line 6-6 of Fig. 2 showing in lan the front and rear sections of the dril head casing. Fig. 7 is a section on the lines 7-7 of Figs. 2 and 9. Fig. 8 is a section on the line 8 8 of Fig. 2. Fig. 9 is a front elevation of the upper portion of the front head section and showing in dotted lines certa-in spindle feed gears later to be referred to. Fig. 10 isa section on the line 10-10 of Fig. 3. Fig. 11 is an inner face view of the rear head section. Fig. 12 is an end view ofthe lution of the drill-head casing, hereinafter bricant nozzle. Fig. 13 is a section on the line 13-13 of Fig. 1. Fig. 14 is an enlarged section showing a drain for the spindlesleeve bearing.

Referring more particularly tothe drawings, the invention is disclosed as embodied in drill-head constructed as a closed casing C within which-is housed all of the mechanism required to rotate and translate the drill spindle S at any one of a plurality of speeds. For convenlence of manufacture, and to facilitate the assembling of the parts therein, the easing is preferably made of a plurality ofsections, viz, front and rear sections 1 and 2 respectively, a cover-section 3 and a section 4 within which the reservoir is formed. As common in machinetools of this type the drill-head is provided with guide-ways 5 and 6 slidably fitted to guides 7 and 8 provided b the usual radial arm 9. The arm 9 is slida ly mounted upon an upright column 10 and the head is adapted to be moved horizontally on the arm 9 but inasmuch as the mechanism for giving these parts their vertical and horizontal movements form no part of this invention, illustration thereof is deemed unnecessary.

Rotatably and translatably journaled in the section 1, is the drill-spindle S which carries, in its lower end, the usual drillpoint the shank of which is indicated at 12 example, a motor located on a rearward ex-' tension -of the arm or on the machine base lll) at the foot of the column. The shaft 13 passes through a portion of the drill-head and has journalled co-axially with it, within the drill-head, two bevel-gears of which one only is shown) maintained permanently in mesh with a similar gear 14 fixed upon a "ertical shaft 15 journalled in bearings 15a and 15b iwithin the section 2. A clutch device, indicated generally as a: is provided for selectively rendering the first named bevel-gears effective t rotate the shaft 15 lin opposite directions. The clutch m is shaft 25 by gear-s in a shaft 26 adapted to be controlled by a lever 16 shown vin F ig.V 1. From the foregoing it will be apparent that the shaft selectively may be rotated in either direction at the same speed as the speed of rotation of the shaft 13. This single speed may be multiplied into thirty-two speeds in the spindle by change-gearmechanisms now to be described. Fixed to the shaft 15 are gear-unitsl and 18 providing gears 19 and 20, and 21 and 22 respectively. These gears are adapted to be meshed with gears 19", 20X, 21X and 22X, provided by gear-units 23 and 24 splined to a shaft 25 journalled parallel to the shaft 15, in bearings 25a, 25b and 25. The gear-units 23 and 24 are adapted to be shifted on the ifting mechanism designatedgenerally as y. Thus the single speed of the shaft 15 may be multiplied into four speeds in the shaft 25. These four speeds may be further multiplied into eight speeds journalled in bearings 26a and 26b in the section 2, co-axial with the shaft 15. This may be effected by means of a gear-unit 27 secured to the shaft 25 and providing gears 28 and 29 adapted selectively to beengaged by gears 30 and 31 respectively provlded y a gear-unit 32 splined to the shaft 26. The speed changes just described correspond to the speed changes which, until more or less recently, were usually effected 'by a speedcontrolling device located adjacent the prime-mover and remote from the operator when stationed at his work.

The eight speeds in the shaft 26 may be multiplied intov thirty-two speeds in the spindle by means of a set of back-geais now to be described. Splined to the shaft 26 is a gear-unit 33 providing gears 34 and 35 adapted selectively to be meshed with gears 36 and 37 provided by a gear-unit 38. This gear-unit 38 is keyed to a shaft 39 journalled 1n bearmgs 39a and 39h in the section 2, parallel with the shaft 26 which also carries a small gear.42 later to be referred to. Journaled within the section 1 of the drillhead is a spindle-'driving sleeve 40 within which the spindle is secured as by means of a spllne 41 (see Fig. 13). This connection between the sleeve and spindle causes the spindle to be rotated with the sleeve but permits 1t to be moved endwise therein for vpurposese well understood. Loosely journaled upon the sleeve is a gear 43--permanently in mesh with the gear 42 on the shaft 39 and provided with clutch-teeth 44. A

gear-unit 45 providing a gear 46 and a clutchmember 47is splined to the sleeve 40 and adapted selectively to be shifted into engagement with clutch-teeth 44 or with a gear 38a forming a part of the gear-unit 38.`

In addition to its rotations the drill-spindle is adapted to bemoved endwise in the sleeve 40. Power to give the spindle its endwise movements is preferably taken from a gear 48 formed on the spindle-driving sleeve. .The gear 48 meshes with a gear 49 forming a part of a spindle feed-mechanism a portion of which is indicated in dotted lines in Fig. 9. The gear 49 is fixed toa shaft 50, journaled in bearings 50 and 50b ,provided by the casing section 1. This shaft also carries a gear-unit 51 providing a plurality of gears adapted selectively to be meshed with gears provided by a similar gear-unit 52 secured to a shaft 53 journaled at its upper end in a bearing 53a. These parts of the feed mechanism are located within anoif-set portion p of the section 1 and are lubricated by means later to be described. The shaft 53 carries, at its lower end, a worm (not shown) which drives a Worm-Wheel 54 secured to a lshaft 55 (see Fig. 1) to which is also secured a pinion 56 in mesh with a rack 57 carried by a nonrotatable sleeve 58 surrounding the spindle and slidably mounted in the front section of the drill-head casing. Relative endwise movement between the spindle and sleeve 58 isprevented by thrust-bearings 59 and 60. Thus rotation of the pinion 56, through the mechanism described results in translation of both the sleeve 58 and the spindle in the rotate independently of the sleeve.

The foregoing illustrates the type of inachine-tool head and the mechanism therein that this invention is adapted generously and continuously to lubricate during the operation of the machine-tool. It is to be noted that the mechanism to be lubricated is' located Within a closed casing and is disposed in various horizontal and vertical planes.

Within the lower portion of the casing C, and preferably in the section 4, is formed a reservoir 61 adapted to hold a supply of lubricant. A continuously operating pump P .draws lubricant from the reservoir through a pipe 62, elevates it through a pipe 63, and forcibly ejects it from a nozzle 64 within the upper portion of the drillhead casing, preferably in the cover 3. The pump may be driven by any suitable means such for example, as bevel-gears 65 and 66 of which the former is secured to the shaft 26 and the latter is fixed to the pump shaft. In the embodiment of the invention shown in Fig. l the pump and piping are located exteriorly of the head but it is to be understood that this invention also contemplates locating all or part of the mechanism within the closed casing.

The lubricant ejected from the nozzle 64 strikes within -the cover 3 from which the greater portion Hows downwardly through all of the bearings and over all of the mechanism in the head and back'to the reservoir as later will be described. The How of lubricant from the reservoir over the mechanism and back to the reservoir is indicated by arrows.

The cover 3 is formed, adjacent its upper end, with a horizontally disposed wall or shelf 67 provided with a depression 68 forming an auxiliary reservoir of small capacity.

The shelf is also formed with a larger de pression or receptacle 69 which communicates with a sight-'feed tube 7() maintained between the shelf 67 and a horizontal wall 71 also provided by the cover 3. Between the shelf and the wall 71 the side wall of the cover is depressed as at 72 to expose to view the tube'70 which is made of transparent material such as glass. A part of the lubricant ejected from the nozzle is received bythe shelf 67 and serves to maintain the auxiliary reservoir filled and also to produce a steady stream through the tube by means of which the operator is assured of the proper functioning of the pump. A substantial amount of the lubricant from the nozzle Hows down the inclined upper wall 73 of the cover 3 until it reaches a baille rib- 7 4 which causes the lubricant to How downwardly upon the upper horizontal wall 75 of the section 2. This wall 75 supports the shaft bearings 26a and 39a which are kept well lubricated by the descending oil.

Beneath the shelf 67 is a second horizontally disposed wall 76 upon which the lubricant, passing through the sight tube 70, descends. This wall is formed at its free edge with an up-standing rib 77 which terminates at 78 short of one of the side walls of the cover, thus forming a sluice 79 through which the lubricant Hows. The wall 76 forms a shield or baHle to deflect the lubricant laterally away from the upper end of the spindle-driving sleeve thereby to prevent it from entering the spindle-bearing therein and way 41a in which the spline 44 moves. This prevents an excessive amount of oil from passing downwardly through the spindle-bearing which, due to the bearing being open at its lower end otherwise would cause dripping of oil from the spindle. much to the annoyance and discomfort of the operator.

The lubricant passing through the sluice 79 descends into a basin or trough 8() formed in the upper surface of the upper horizontal wall 75].of the section 2. A like basin 81 formed in the upperside'of a wall 82 pros vided by the section 1- is so arranged that when the sections 1 and 2 are bolted together the two basins form a single receptacle adapted to receive the lubricant from the sluice 79 (see Fig. 6). The basin 81 terminates at one end in a vertical wall 83 later to be referred to. Communicating with the basin 81 are two ports 84 and 85. The port 84 leads through a. vertically disposed bearing wall 86 providing an upper bearing for the spindle sleeve 40. The port 85 leads downwardly from the basin and is arranged above the gear 49 forming a part of the spindle feed-mechanism hereinbefore re ferred to. A portion of the oil received upon the gear 49 is distributed to the upper bearings of the 'shafts 50 and 53 and a-portion thereof Hows through an aperture 87 formed in a horizontal wall 88 connecting the bearings. The oil Howing through the aperture 87 lubricates the lower bearings of the shafts 50 and 53and the other gears of the spindle feeding mechanism. The oil having passed through the bearings of the spindle feed mechanism and over the gears thereof it is drained back into the section 2 and finally Hows back to the reservoir. The height of the wall 83 is less than the height of the other walls of the basins and 81 andtherefore forms a spillway over which'the excess lubricant Hows. The lubricant Howing over the wall 83 enters an inclined passageway 88 and is conducted back into the section 2. p

. The upper horizontal`wall 75 is formed with apertures 7 5a, 75"` and 75c which permit a portion of the lubricant received by the wall to How downwardly therethrough over the.. gears and throughI the bearings therebeneath. The Wall terminates at 7 5d which affords a passage-way- 7 5 through which the lubricant Hows upon the gears of the back-gear mechanism `hereinbefore described.

A portion f the oil passing over the backgears finds its way into the lower bearing 86a of the spindle-sleeve 40 'through oil-grooves 92 and 93 provided by bearing bushings 43a and 86" for the gear 43 and sleeve 40 respectively. To prevent this oil from escaping from thelower end of the bearing 86a and Howing down the spindle an escape port 94 is formed through the bushing 86" and through the wall of thesection 1. An oil-deHecting ring 95 having a portion extending above the port 94 serves to deHect the oil out through the port 94 and back into the section 2.

An intermediate horizontal wall 89 sup@ ports the bearings 15a, 25", 26" and 39a and these bearings are kept well lubricated by the oil Howing down from the Aparts above. The wall 89 is also provided with a plurality of apertures to permit passage of the oil to the parts tl1erebelow.` These apertures are indicated at 89a in Fig. 7. Having passed through the bearings 15'?, 25, 26h and 39 andoverthe'gear-units 17, 18, 23 and 24 the oil descends upon a third horizontal wall 91 supporting the bearings 15b and 25c through which a portion of the oil flows. This wall is also provided with oil passages 91a to permit flow of the oil over the main driving and reversing gears and back to the reservoir 61.

As hereinbefore described the lower end ofthe spindle-bearing is open, and to prevent the lubricant from dripping therefrom it is desirable ,that only a small quantity be supplied to this bearing. This has been accomplished in a very ingenious manner now to be described. Threaded into the cover 3, in registry, with the auxiliary reservoir 68, is a sight-feed oiler 96 provided with a feed-regulating screw 97. The oiler 96 is preferably of inverted L-shape and to the lower end is attached an oil tube 98 which extends into the cover 3 and down into a bore 99 formed in the spindle. This tube being telescopically connected with the spindle affords means for supplying lubricant to the bore 99 in all of the vertical positions of the spindle. A transverse bore 100 of small diameter connects the bore 99 with the spindle bearing 101 and permits a constant seepage of oil to that bearing. It is to be noted that the auxiliary reservoir 68 is of small capacity and it is kept illedat all times from the nozzle 64. Due to the small capacity of the auxiliary reservoir the sightfeed oiler '96 is maintained pressure-free, therefore there is no variance in the amount of oil let into thebore 99.

As shown in Figs. 1, 2, 6 and'7 the sec-* tions 1 and 2 are bolted together along the vertical line t. To prevent the lubricant from seeping out between these sections the section 2 is formed in its abutting face t2 with an oil-groove t3 which extends around three sides of the section. Thus any oil that might seep outwardly between the two sections will be received by the groove 3 and conducted to the lowest point therein and into an inclined port-t* which directs the oil into the bearing 15b from which it flows back to the reservoir.

It is to be noted that the pump P is connected with the driving mechanism between the controlling clutch w and the spindle and therefore when the clutch is shifted to its neutral position to stop rotation of the spindle the pump is brought to rest. With this arrangement movement of the lever 16 simultaneously effects both the spindle driving mechanism and the lubricant pump.

The lower wall pf of the olf-set portlon p is formed with an upstanding annular wall p2 surrounding the shaft 53. A11 oil-deectingcanopy p8 is xed to the shaft 53 adjacent the upper end of the wall p2 and has its lower edges overhanging said wall. Thus oil flowing down from the gear-unit 52 is deflected away from the shaft and finally returned to the reservoir, thereby being pre vented from following down 'the shaft and` escaping from the casing.

From the foregoing it will be perceived that there has been provided simple and eilicient means, wholly embodied in a radial drill-head for continuously and generously lubricating all of the bearings and mechanism located in various vertical and horizontal planes. Also that means has been providedjor continuously supplying lubricant to the open-end spindle bearing in such amounts as to precludedripping of oil from the bearing.

lVithout further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying ,current knowledge, readily adapt it for 4various utilizations by retaining one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, I claim as new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of the United States:

1. In a drill-head, in combination, a casing; a drill-spindle rotatably mounted in said casing; a power shaft; speed-change mechanism arranged in a plurality of vertical and horizontal planes within the casing to rotate said spindle at any one of a plurality of speeds from said power shaft; and a circulatory lubricating system wholly incorporated in said drill-head for continuously lubricating said speed-change mechanism, said lubricating system comprising a lubricant reservoir in the lower portion of the casing; a pipe `having one end entering said reservoir and its other end open and located in the upper portion of said casing; a pump to force lubricant from said reservoir through said pipe to eject it into the upper end of said casing; and battles intermediate the open end of said pipe and said speed-change gearing to deiiect' the lubricant horizontally thereby permitting it to descend by gravity onto said gearing. U

2. In a radial drill-head, in combinatlon, a closed casing; a drill-spindle rotatably mounted in said casing; a power-shaft; a plurality of serially arranged speed-change mechanisms lwithin said casing adapted to rotate said spindle at different speeds from l said Vpower shaft, said speed-change mechanisms being located a plurality of horlzontal and vertical planes; and means for effecting a constant flow of lubricant over said speed-change mechanisms.

3. In a radial drill-head, in combination, a spindle rotatably journaled in said drillhead; a power shaft; an operative connection between the power shaft and the spindle including a plurality 'of shafts journaled in bearings in the drill-head and a plurality of relatively shiftable gears carried by said shafts, said gears and shaft bearings being in a plurality of vertical and horizontal planes; and a circulatory lubricating system including lubricant circulating mechanism and lubricant deflecting walls incorporated in said head and adapted continuously to lubricate said bearings and said gears.

4. In a radial drill-head, in combination, a casing; a spindle rotatably journaled in said casing; a lubricant reservoir formed in said casing; a power shaft; means, including a plurality of shafts journaled in bearings in the drill-head and a plurality of ears carried by said shafts, for rotating sai spindle from said power shaft, said gears and shaft bearings being located in a pluralityY of horizontal and vertical planes; and means including a power-driven pump and suitable piping, carried by the drillhead, for elevating lubricant from said reservoir and ejecting it into the upper portion of said casing, above said gears and bearings, and a plurality of lubricant collecting walls within s'aid casing overlying said gears and bearings and provided with passages through which the lubricant flows by gravity over the various gears and through the various bearings back to said reservoir.

5. In a drill-head, in combination, a casling; a spindle rotatably journaled in said casing; a pluralit of vertically spaced horizontal'walls within said casing each providing a plurality of horizontally spaced bearings and a plurality of horizontally separated and vertically disposed lubricant passages; a plurality of vertically disposed shafts journaled in said bearings; a-power shaft; a driving connection between said power shaft and one of said vertical shafts; a. plurality of intermeshing gears carried by said vertical shafts for rotating said spindle from said power shaft; a lubricant reservoir; means for elevating lubricant from said reservoir and ejecting it in said drill-head above the upper of said horizontal walls, said bearings, gears and lubricant passages bein :so constructed and arranged that the lubricant flowing through said passages passes over' all of-said gears and through all of saidbearings in flowing back to said reservoir.

6. In a drill-head, in combination, a casv ing; a spindle rotatably journaled in said casing; a lubricant reservoir formed in said casing; a. power shaft; means, including a.

plurality of shafts journaled in bearings in the drill-head and a plurality of gears carried by said shafts, for rotating said spindle from said power shaft; means, including a power-driven pump and suitable piping, carried by the drill head, for elevating lubricant from said reservoir and ejecting it into the upper portion of said casing. above said gears and bearings, from which the lubricant flows by gravit7 over the various gears and through the various bearings back to said reservoir: and a sight-feed oil-tube adapted to receive and pass a substantial part of the lubricant ejected by said pump by means of which the operator may determine the action of said pump.

'i'. In a drill-head comprising front, rear, cover and reservoir sections adapted to be bolted together to form a closed casing: a spindle rotatably mounted in said front section; a plurality of shafts journaled in bearings in said rear section and adapted to rotate said spindle at anyone of a pluralit)v of speeds; driving means operatively connected with'one of said shafts; means for elevating lubricant from a reservoir in said reservoir section and ejecting it into said cover-section for subsequent descent over said gears and through said bearings: means within said cover-section for collecting a substantial part of the lubricant ejected into the cover-section; anda transparent oil tube visible from the exterior of the casing adapted to receive and conduct the lubricant from said collecting means thereby to indicate the action of said lubricant elevating means. .y

8. In a drill-head, in combination, a cas` ing, a spindle-driving sleeve rotatablyv jour-A naled in bearings carried by said casing; .1 spindle held to rotate with said sleeve: change-gear mechanism adapted to rotate said sleeve and spindle at any one of a plurality of speeds; means to continuously lubricate said change-gear mechanism and the bearings for said sleeve: and means to prevent oil from dripping from the lowei` sleeve bearing, said means comprising an oil-passage through the Wall of the casing and an oil-deiiecting device adapted to cause the oil passing through the bearing to be defiected through said passage and back into the closed casing.

9. In a drill-head, in combination, a casing; a non-rotatable sleeve translatably mounted in said casing; a spindle rotatably `iournaled in said sleeve; means to rotate said spindle; means including a lubricant conducting pipe to continuously lubricate the 'spindle-bearing in said sleeve; and an adjustable sight-feed oiler connected with said pipe to regulate and indicate the amount of lubricant applied to said bearing. 10. In a drill-head. in combination, a casjournaled in said casing;

journaled in said sleeve; means to rotate said spindle; meansto continuously lubricate the spindle-bearing in said sleeve; said means comprising a reservoir located above said spindle bearing, means to keep said reservoir lil-led with lubricant, a lubricant passage from said reservoir to said bearing; and an adjustable sight-feed oiler embodied in said passage to regulate and indicate the flow of lubricant through said passage.

11. In a drill-head. in combination, a casing; a non-rotatable sleeve translatably a spindle rotatably but non-translatably journaled in said sleeve; means to rotate and translate said spindle in said casing; means to continuously lubricate the spindle-bearing in said sleeve in all of the vertical positions of said spindle', said lubricating means comprising a reservoir, meansl to keep said reservoir filled with lubricant, a lubricant chamber in said spindle having a. passage to said bearing, and an extensible connection between said reservoir and said lubricant chamber.

12. In avdrill-head, in combination, a cas ing; a non-rotatable sleeve translatablv journaled in said casing; a spindle rotatably journaled in said sleeve and movable axially therewith; means to rotate said spindle in said sleeve; means to translate saldsleeve in said casing; means to continu` o'usly lubricate the spindle-bearing in said sleevein all of the vertical positions of said spindle, saidlubricating means comprising a reservoir, means to keep said reservoir .filled with lubricant, a lubricant chamber in said spindle having a passage to said bearing, an extensible connection between said reservoir and said lubricantJ chamber; and a sight-feed oiler embodied in said extensible connection to regulate and indicate the flow of lubricant to said bearing.

13. In a drill-head, in combination, a casing; a non-rotatable sleeve translatably journaled in said casing; a spindle rotatably journaled in said sleeve and movable axially therewith; means to rotatesaid spindle in said sleeve; means to translate said sleeve in said casing; means to continuously lubricate the spindle-bearing in said sleeve in all of the vertical positions of said spindle, said -lubricating mea-ns comprising a reservoir-means to keep said reservoir filled with lubricant, a bore lengthwise of said spindle; a transverse bore connecting said first named bore with the spindle-bearing surface, and a tube connected with said reservoir and extending telescopically into said first named spindle bore.

14. Ina drill-head, a casing; a sleeve rotatably journaled in vided with a spindle receiving bore; a spindle translatably mounted in said bore; means for continuously supplying a stream of, lubricant within said drill-head above said said casing and pro-4 sleeve; and means to deflect the lubricant away from the upper end of said sleeve -to prevent it from entering said spindle-bore.

15. In a drill-head, in combination, a casing including a cover-section; a spindle rotatably journaled in said casing; driving means; a plurality of change-speed gears opcrativcly connecting said driving means With said spindle; -a lubricant reservoir formed in said casing: means for continuously elevating lubricant from said reservoir and ejecting it into said cover-section; an auxiliary reservoir sustained by said cover-section and maintained iilled by the lubricant ejected into the cover-section; a second lu` bricant receptacle providedl by the cover-section: means to convey lubricant from said auxiliary` reservoir to the spindle bearing; means to convey lubricant from said second receptacle to said speedfchange gears; and meansembodied in each of said conveying means to indicate the flow of' lubricant therethrough.

16. In a. drill-head, in combination, a casing; a sleeve translatably but non-rotatably mounted in said casing; a spindle rotatably journaled in bearings provided by said sleeve; a power-shaft; a pluralityof shafts and change-gears operatively connecting said power-shaft with Said spindle; a continuously acting circulatory lubricating system for lubricating said change-gears; and a continuously acting non-circulatory means for lubricating the spindle-bearings.

17. In aldrill-head, in combination; a closed casing; a drill-spindle rotatably journalcd therein; a power shaft; a plurality of vertically disposed shafts journaled in bearings within said'casing, said bearings being located in a plurality of vertical and horizontal planes; a reservoir in the lower portion of said casing; means for continuously elevating lubricant from said reservoir and ejecting it into the upper portion of said casing; basins in said casing for catching the ejected lubricant; ports provided by said basins for flooding the uppermost bearings with lubricant; and means permitting said lubricant to cascade down over said gears and through said nearings back to said reservoir.

18. In a drill-head, in combination, a casing; a spindle-rotating sleeve rotatably journaled in bearings therein; a spindle splined within said sleeve; a power shaft; an operative connection between said power shaft and said sleeve, said connection 1ncluding a plurality of speed-change gears; means including speed-change gears for translating said spindle; a lubricant reservoir; means for elevating lubrlcant from said reservoir and ejecting it intosaid casing above said change-gears; means to delect the lubricant away from the upper bearing of said sleeve; means below said dejournaled in vertically spaced bearings in` said casing; means to rotate said sleeve;

a reservoir in said casing; means yfor transerring lubricant from said reservoir to said casing above said sleeve; means to de- '.for said sleeve; a basin located beneath said delecting means to receive the delected lubricant; means to conduct a portion o Said deilected lubricant back to the upper sleeve bearing at a point below its uppersurface; an overflow for said basin; and.

means to conduct back to said reservoir the oil passing said overflow.

20. In a drill-head, in combination, a casing; a drill-spindle rotatably and translatablyjournaled in said casine, said means includinga spindle-rotating sleeve; a spindle translating sleeve; a power-shaft; a speed-change driving connection between 4said power shaft and said spindle rotating sleeve; "a driving connection between said spindle rotating sleeve and said spindlev 'translating sleeve; a lubricant reservoir; means to effect a constant flow of lubricant from said ,reservoir to within said casing above said sleeves; means to deflect lubrifl'ect lubricant away from tlie upper bearing` vcant away from the said spindle rotatin sleeve; and means `to receive the deiiecte lubricantand to conduct it back adjacent said sleeve and to deposit a portion thereof on said spindle `translating gears.

21. In-a drill-head, .in combination, a phtralit-y of sections adapted to'tbe secured .together to form a closed casing; a spindlerotatably journaled in said casing; means to rotate said spindle; means to e'ect a continuous circulation of oil over said spindle-rotating means; and means to prevent leakage of oil from between two of said sections, said last-named means comprising an oil conducting channel formed in the meeting face of one of said sections and means to drain said channel. i

22. In a drill-head; in combination, a closed casing; a spindle-driving sleeve rotatably journaled in verticallyl disposed bearings provided by said casing; a spindle head to rotate with said sleeve; means to rotate said sleeve and thereby said spindle; means to continuously lubricate the bearings for said sleeve; and means to prevent dripping of oil from the lower sleeve bearing, said means comprising an annular oil collecting chamber at the lower end of said spindle sleeve; and anA oil duct leading from said annular chamber into said closed casing to return the oil from the lower end of said bearing back into said casing.

In witness whereof, I have hereunto subscribed my name.

DAVID o. KLAUSMEYER. 

